Quick-action double-gear jack



Patented July 2 1922.

2 SHEETSSHEET l.

Hg. 2 v

INVENTOR w m M,

2%,; ATTORNEY A. W. MARR.

QUICK A-CTION DOUBLE GEAR JACK.

APPUCATION FILED OCT. is, 1920.

' Fig-A A. W. MARR.

QUICK ACTION DOUBLE GEAR JA-CK.

APPLICATION FILED OCT. 8. -1920.

1,4Q336'71 I. Patented July 25, 1922 2 SHEETSSHEET 2.

Fig.5 F79 6 I9 INVENTORI 4,; ATTORNEY ALEXANDER W. MARE, OF CANTON, OHIO.

QUICK-ACTION DOUBLE-GEAR JACK.

mason.

Specification of Letters Patent.

Patented July 25, 1922.

Application filed October 8, 1920. Serial No. 415,620.

To-aZZ whom it may concern:

Be it known that I, ALEXANDER ll. Mann, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Quick-Action Double-Gear or lower position.

Jacks, of which the following is a specification.

The principal object of my invention is to provide a simple, strong and efiicient quick-action double-gear jack by which so great a load as a five-ton automobile truck may be speedily liftedwith a minimum of effort.

Another object of the invention is to provide a lifting bar whose teeth are interstepped or made zigzagv to increase the strength of the bar and the lifting power of the jack.

It is still another object of my invention to provide ball and socket means to permit the plunger-carrying slide to be released from its upper and lower positions by a blow from the jack handle or other instrument.

Another object of the invention is the pro vision of pawls and gears for the jack, that are constructed of laminations to cheapen its construction. 1

It is still another object of my invention to provide plungers that are-secured to the slide, and not to the pawls which they press into engagen'ient with the teeth of the liftlng bar as shown in my Patent No. 1,257,508 granted February 26th, 1918.

()ther important and incidental objects will be brought out in the following specifi cation and particularly set forth in the subjoined claims.

In. the accompanying drawings, Figure 1 is a side elevational view of my improved jack. Figure 2 is a-frontelevationa-l view thereof. Figure 3 is a longitudinal sectional view taken through the ball and spring construction for holding the slide in its upper tional view of one of the laminated pawls. Figure 5 is a side elevational View of said jack with the side plate removed to show the lifting devicesin their bar raising positions. Figure 6 is a side elevational view of said ack with the side plate removed, showing the bar lowering position of said lifting devices. And Figure 7 is a side elevational view of a plunger and spring, wlth its cylindrical housing in section.

Throughout the specification and draw- .Figure 4 is a side eleva ings, similar reference characters denote corresponding parts.

Referring to the accompanying drawings,

the numeral 1 designates a base having a central opening adapted to receive the lower end of a tubular standard 2 around whose bottom portion are turned up, and suitably secured thereto, a series of triangular flanges (See Figures 1 and 2.)

Vertically movable within the tubular stai'idard 2 is a lifting bar 1 to the upper end of which is secured a concave head Formed along the front and rear sides of the lifting bar 4c is a series of downwardlypointed ratchet teeth 6 in zigzag or interstepped arrangement with each other. In other words, a tooth on one side is on a horizontal line that would pass midway between two teeth on the opposite side. This zigzag toothed bar, co-operating with the doublegear construction to be hereinafter described, permits the bar to be raised f ths of an inch, or lowered {t -the an inch, on every up or down stroke of the lever respectively, thus approximately doubling the lifting power of the jack over that of the one shown in my beforementioned patent. This zigzag arrangement of the teeth on the bar 4:. also permits the bar to be dropped into the standard after the: weight has been removed from it.

The staggered ratchet teeth 6 are adapted to be engaged by a pair of upwardly pointed lifting pawls 7 pivotally supported within the following described frame construction provided on the upper part of the standard '2. As shown in Figure l, each pawl 7 is constructed of laminations whereby it may be made in the punch press to cheapen its manufacture.

Preferably screwed to each side of the upper portion of the tubular standard 2, is a fan shaped plate 8. To the lower middle portion of each plate 8 there is pivotally secured, by means of a pin 9, a toothed sector 10, which is laminated in order to chea-pen its construction. (See Figures 1 and 2.)

Each laminated toothed sector 10 has a rearwardly projecting portion 11, and between these portions 11 there is secured a short shaft 12- upon which one of the lifting pawls 7 is loosely mounted. A similar shaft 12 is secured between the front ends of the sectors 10, to form a pivot for the other lifting pawl 7. These two shafts 12 loosely project through arcuate slots 13 provided in each one of the plates 8 to allow said shafts, and the pawls 7 which they carry, anup and down movement when the sectors 10 are given an oscillatory movement by the. means new to be described.

Loosely mounted on a shaft 14 secured between ears 15 on the plates 8, are two laminated sectors 16 whose teeth engage the teeth of the sectors 10. The inner lamination of each sector 16 is turned inwardly and forwardly to form together a stem that receives a sleeve 1.7 in which may be readily inserted, a handle 18. in the inner end of the sleeve 17 there is a plug 19 toprevent the handle 18 from being thrust through it during insertion, said plug being held in place by two inwardly turned intogral fingers 20 on the sleeve, in holding the latter on the stem formed by the inner laminations of the sectors 16. (See Figures 1, 5 and 6.)

For the purpose of co-operating with the Zigzag toothed bar in raising heavy loads, the sectors 16 and 10 are so disposed as to have a gear ratio of two to one respectively.

In order to cause the pointed ends of the lifting pawls 7 to engage the ratchet teeth 6 of the lifting bar 4 to raise it when the ack lever is operated, the following construction is provided. Referring to Figures 1, and 6, there is provided on one side of the standard 2 between it and a respective side plate 8, a vertically movable slide 20. The latter comprises two flat vertical members 21 that are secured at their bottom ends to a transverse member 21 having a central recessed portion that enables it to clear, for a short distance during its upward movement, the downwardly projecting tongue part 22 of the side plate 8. (See Figure 1.)

Each vertical member 2]. of the slide :20 has an upper and a lower longitudinal. slot 23 and 24 respectively. Through the upper slots 23 there project large headed guide pins 25 secured to the inner portion of the plate 8, while similar guide pins 26 project inwardly from said plate through the lower slots 24 in the vertical members 20. Each vertical member 2]. also has a middle inwardly projecting ear 27 to which issecured, at right angles thereto, a small cylinder 28. lVithin each cylinder 28 a plunger 29 adapted to be forced into engagement with the rear surface of a respective yaw], 7 by a coil spring 30 within the rear portion of the cylinder. (See Figures 5, 6 and 7.)

For the purpose of raising and lowering the slide 20 to bring the plnngcrs into en gagement.respectively with the upper and lower surfaces of the pawls 7, an outwardly projecting cylinder Si is secured to the middle portion of the transverse portion 21 of the slide. Seated within this cylinder 31 is a'coil spring position; respectively.

that also assist adapted to force a ball into an upper concave recess 84:, or a lower concave recess35, of the standard 2 to hold the slide 20 in its uppermost or lowermost (See Figures 1, 2 and 3.)

When the ball 33 is in the upper recess 34 of the standard 2, the pawls? are in the proper position to elevate the lifting bar 4. Now when the operator reciprocates the handie 18, the sectors 16 will impart an oscillatory movement to the sectors 10, which in turn will reciprocate the shafts 12 to carry the pawls 7 up and down. During the upward movement of one pawl, its'nose per tion will be forced into engagement with a tooth6 on thebar 4: by its respective plunger 29, since the slide 20 in its upper position brings the pressure of the plunger against the upper portion of the pawl. During this upward movement of one pawl 7, the other one will be lowered by its respective shaft 12, with its nose portion riding idly over the teeth on the bar versa, as the operating leveris moved from one extreme position to the other. During each up and down-movement of the operating handle 18,the bar 4 will be raised, since when one pawl is travelin downward; the other one is being carried upward in engagement witlra tooth on its respective side ofthe bar 4. i i a When it is desired to lower the load, the cylinder 31 may be struck from above by the removed handle 18 or other instrument, to force the slide 20 downwardly to the position in which the ball 33 will'rest within the recess 35 in the standard 2. i It is thus unnecessary for one to stoop down to lower the slide withthe hand. i p,

l Vhen the slide 20 is in its lowermost pos1 tion, the load carried. by the bar dis lowered as follows, Referring to Figures 1, 2, 5 and 6, a transverse pin 36 is secured between the side plates 8 above the beveled nose portion of each pawl 7. lowermost position, the plungers 29-will have transferred their pressure to the lower rear portions of the pawls 7 As the beveled nose portion of each pawl 7 passes under a respective pin 36, it will be forced by it, instead of a plunger 29, into engagement with a tooth 6 on its respective side of the lifting bar. If the weight of the load uponthe lifting bar 4 is approximately five ponnds,'it will besufficient to cause the nose portion of the pawl to be held in engagement with the tooth to sustain the descending load, since a load of that weight will he suflicient to hold the pawland tooth in engagement against the pressure exerted on the lower end of the pawl by its respective plunger 29. And when that particular pawl has reached its extreme lower position, the noseportion of the other one will he forced, by its respective pin 36, into engagement with a tooth on its side of the 4, and vice lifting bar t to receive the weight of the load. At this point the plunger 29 that presses against the lower end of the first named pawl, will exert its force against the lower end of said pawl to withdraw its upper end from engagement with the ratchet tooth 6, since the weight of the load has now been transferred to the other pawl.

It will now be seen that the nose portion of one pawl will remain in engagement with a tooth on its respective side of the lifting bar 4: to sustain the weight of the load until the operating handle 18 reaches one extreme position, whereupon the other pawl, will be forced into engagement with a tooth on its respective side of the lifting bar 4. and let the weight down still further during the movement of the handle to its other extreme position, this alternate operation being continued until the lifting bar 4 is completely relievedof its load. After this point is reached and the handle is brought to a horizontal position, the lifting bar at will drop to its normal" since there is no weight upon it to position, hold its teeth 6 in engagement with the nose portions of the pawls. Likewise, the lifting bar may be as speedily lifted to the load without operating the sector mechanism.

It will thus be seen that I- have provided an extremely powerful quick'action jack in which the number of parts have been reduced to the minimum. The small number of parts, together with the laminated construction of many of them, enables the jack to be produced cheaply without sacrificing its efiiciency. It is convenient in operation, for it may be actuated by one in a standing position through a handle inserted in the sleeve 17. Nor is it necessary for one to stoop down to move the slide 20 with the hand to its lowermost position when it is de'siredto lower the load, for this may be done by striking the cylinder 31 a blow with the removed handle 18 or other instrument.

Having described my invention, I claim:

1. In a jack, the combination with a tubular standard, of a lifting bar therein having ratchet teeth on two opposite sides, the teeth on one side of said bar being disposed. in zig zag relation to the teeth on the other side of said bar, lifting elements for alternately engaging the teethon said bar, and reduction gear means for, imparting an alternate up" and down movement tosaid lifting elements to raise thelifting bar, said reduction gear means and the zigzag disposed teeth on the liftingbar co-operating to lift. a heavy load.

2. In a jack, the combination with a tubular standard, of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of toothed members pivotally secured to said frame, a pair of lifting pawls pivotally mounted between the toothed members, for alternate movement thereby into engagement with the teeth on the lifting bar to raise it, a second pair of toothed members in engagement with the first pair, and a handle for imparting an oscillatory movement to the second pair of toothed members, and through them to the toothed membersof the first pair. to give an alternate up and down movement to the pawls for the purpose specified.

3. In a jack, the combination with a tubular standard, of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of sectors pivotally secured to said frame, a pair of lifting pawls pivotally secured between said sectors, for alternate movement thereby into engagement with the teeth on the lifting bar to raise it, a second pair of sectors in engagement with the first pair, and a handle for imparting an oscillatory movement to the second pair of sectors, and through them to the sectors of the first pair, to impart an alternate up and down movement to'the pawls for the purpose specified.

4. In a jack, the combination with a tubular standard, of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of oppositely disposed lever elements fulcrumed to said frame, a shaft secured between said lever elements on each side of the fulcruming means, a pawl loosely mounted on each shaft, adapted to be given an up and down movement when the lever elements are reciprocated, a vertical slide within said frame, and a pair of spring pressedplungers carried by said slide, for movement into engagement with the upper portions of said pawls to hold their nose portions in engagementwith'the teeth ofsaidlifting bar, whereby the latter may be raised when the lever elements are reciprocated.

5. 111a Jack, the combination with a tubu lar standard, of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of oppositely disposed lever elements fulcrumed to said frame,-a shaft connected between said lever elements on each. side of the fulcruming means, a pawl loosely mounted on 'each shaft, adapted to be given an up and down movement when the lever elements are reciprocated, a vertical slide within said frame, a pair of oppositely-disposed ears on said slide, a cylinder secured to'each ear at right angles thereto, a plunger in each cylinder, and a spring in each cylinder adapted to press the plunger therein,-into engagement with the upper rear portion of a respective pawl, to hold the nose portion thereof in engagement with the teeth on the lifting bar,

whereby the latter may be raised when the lever elements are reciprocated.

6. In a jack, the combination with a tubular standard, of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of pawls within said frame, means adapted to give said pawls an alternate up and down move-- ment, a slide vertically movable within said frame, and compression means carried by said slide, adapted to automatically exert an inward force upon the upper and lower rear portions of said pawls when the'slide is raised and lowered, to hold the nose portions of the pawls in engagement with the teeth on the lifting bar in the first instance and out of engagement therewith in the second instance. a A

7. In a jack, the combination with atuhular standard, of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of pawls within said frame, a pair of guide pins secured within said frame, a pair of Vertically movable members within said frame provided with longitudinal slots througlrwhi ch said guide pins 'project,-a transverse actuating bar secured to, the bottom ends of the vertical members, a pair of oppositely-disposed ears onsaid verticalmembers, a cylinder secured to each ear at right angles thereto, and compression elements withsaid cylinders adapted to automatically exert an inward force upon the upper andlower rear portions of said pawls when the vertical members are raised and lowered','to hold the nose portions of the pawls in engagement with the teeth on the lifting bar in the first instance and out of engagement "therewith in the second instance. 1 i

8. In a jack, the combination with atubular standard, of a lifting bar thereon having ratchet teeth on two opposite sides, a frame secured to said standard, a pair/of pawls within said frame, means adapted to give said pawls an alternate up and down movement, a slide vertically movable within said compression means carried by said frame, slide, adapted to automatically exert an inward force upon the upper and lower rear portions of said pawls when the slide is raised and lowered, and a spring pressed plunger carried by said slide adapted to enter an upper and a lower recess in the outer surface of the standard, tohold said slide in its upper and lower position respec- 1 tively for the purpose specified.

9. In a jack. thecombination with a tubular standard, of a lifting bar thereon having ratchet teeth on secured to said standard, a pairof pawls within said frame,-means adapted to give said pawls an alternate up and down movement, a slide vertically movable within the frame, compression means carried by said slide, adapted to exert an inward force upon the upper and lower rear portions of said.

plunger two opposite sides, a frame pawls when the slide is raised and lowered, an outwardly projecting cylinder on said slide adapted to be struck by an instrument to raise and lower the latter, and a springpressed plunger within said cylinder adapted to enter an upper and a lower recess in the, outer surface of said standard, to hold said slide in its upper and loWer positions respectyely until said plunger is withdrawn from one of said recesses bya blow on the cylinder. i

i v 10. In a jack, the combination with a tubular standard, of a lifting bar, means for lifting and lowering said bar, a slide for ad justing-saidmeans in their raisingor lowering positions, an outwardly projecting cylinderon said slide adapted to be struck by an instrument to raise andv lower the latter, and a spring-pressed plunger within said cylinder adapted to enter an upper and a lower recess in the outer surfaceof said standard, to hold said slide in its upper and lower positions respectively until said is withdrawn fromone of said recesses by a blow on the cylinder.

11. In aj ack, the combination with atubular standard, of a lifting bar therein having ratchet teeth thereon, a frame secured to saidstandard, a pairof laminated toothed members pawls carriedbysaid toothedmembers for engagement with the teeth on said lifting bar to raise it,'a'second pair of laminated toothed. members in engagement with the first pair, the inner laminations of the second pail." of toothed members terminating in an outwardly projecting stem, a handle-receiving sleeve on said stem, a plug in the front end of said sleeve, and curved fingers onsaid. sleeve adapted to hold the'latter on the stem and to limit the inward movement of said plug. i i

12. In a jack,'the combination with a tubular standard. of a lifting bar therein having ratchet teeth on two opposite sides, a frame secured to said standard, a pair of sectors pivotallysecured 'to said frame, a second pair'of sectors pivotally secured to said frame in engagement with the first pair of sectors, 3. pair of laminated pawls adapted. to be carriedby the first sectors into alternate engagement with the teeth onthe lifting bar to raise it. and a slide within said frame for transferring pressure from the upper to the lower rear portions of said pawls for the purpose specified.

In testimony whereof I have hereunto set my hand this 7th day of september, 1920.

ALEXANDER .VV. MARR. i

pivotally secured to said frame, 

